Agilent Technologies E4438C - Local Lockout Using NI-488.2 and C

Programming Examples
GPIB Programming Examples
Chapter 2 39
Local Lockout Using NI-488.2 and C++
This example uses the NI-488.2 library to set the signal generator local lockout mode. Launch
Microsoft Visual C++ 6.0, add the required files, and enter the following code into your .cpp
source file.
The following program example is available on the ESG Documentation CD-ROM as
niex2.cpp.
// ************************************************************************************
// PROGRAM NAME: niex2.cpp
//
// PROGRAM DESCRIPTION: This program will place the signal generator into
// LOCAL LOCKOUT mode. All front panel keys, except the Contrast key, will be disabled.
// The local command, ’ibloc(sig)’ executed via program code, is the only way to
// return the signal generator to front panel, Local, control.
// ************************************************************************************
#include "stdafx.h"
#include <iostream>
#include "windows.h"
#include "Decl-32.h"
using namespace std;
int GPIB0= 0; // Board handle
Addr4882_t Address[31]; // Declares a variable of type Addr4882_t
int main()
{
int sig; // Declares variable to hold interface descriptor
sig = ibdev(0, 19, 0, 13, 1, 0); // Opens and initialize a device descriptor
ibclr(sig); // Sends GPIB Selected Device Clear (SDC) message
ibwrt(sig, "*RST", 4); // Places signal generator in a defined state
cout << "The signal generator should now be in REMOTE. The remote mode R "<<endl;
cout <<"annunciator should appear on the signal generator display."<<endl;
cout <<"Press Enter to continue"<<endl;
cin.ignore(10000,’\n’);
SendIFC(GPIB0); // Resets the GPIB interface
Address[0]=19; // Signal generator’s address
Address[1]=NOADDR; // Signifies end element in array. Defined in
// DECL-32.H
SetRWLS(GPIB0, Address); // Places device in Remote with Lockout State.
cout<< "The signal generator should now be in LOCAL LOCKOUT. Verify that all
keys"<<endl;
cout<< "including the ’Local’ key are disabled (Contrast keys are not
affected)"<<endl;
cout <<"Press Enter to continue"<<endl;
cin.ignore(10000,’\n’);
ibloc(sig); // Returns signal generator to local control